Recently, I am interested in amino acid coordinated hemes, so I was trying to purchase some kinds of heme but I couldn't.

Because my major is not a Microbiology (or not related to an enzyme), the purification methods written in the papers are not accessible to me. Commercial hemes are the only ones that I can get, but they are just simple hemes.

Can I ligate certain amino acids to a heme without any microbial methods? If so, where can I get the ligation/synthesis methods? Or where can I get (purchase) amino-acids-coordinated hemes?

Thanks for replying